var rollermenu = {
	startSize : 32,
	endSize : 48,
	imgType : ".png",
	init : function () {
		var animElements = document.getElementById("roller_menu").getElementsByTagName("img");
		//var titleElements = document.getElementById("roller_menu").getElementsByTagName("span");
		
		/*
		for(var j = 0; j < titleElements.length; j++) {
			titleElements[j].style.display = 'none';
		}
		*/
		
		for (var i = 0; i < animElements.length; i++) {
			var y = animElements[i];
			y.style.width = rollermenu.startSize + 'px';
			y.style.height = rollermenu.startSize + 'px';
			rollermenu.imgSmall(y);
			animElements[i].onmouseover = changeSize;
			animElements[i].onmouseout = restoreSize;
		}
		
		function changeSize() {
			rollermenu.imgLarge(this);
			//var x = this.parentNode.getElementsByTagName("span");
			//x[0].style.display = 'block';
			
			if (!this.currentWidth) 
				this.currentWidth = rollermenu.startSize;
				
			rollermenu.resizeAnimation(this, this.currentWidth, rollermenu.endSize, 15, 10, 0.333);
		}
		
		function restoreSize() {
			//var x = this.parentNode.getElementsByTagName("span");
			//x[0].style.display = 'none';
			
			if (!this.currentWidth)
				return;
			
			rollermenu.resizeAnimation(this, this.currentWidth, rollermenu.startSize, 15, 10, 0.5);
			rollermenu.imgSmall(this);
		}
	},
	
	resizeAnimation : function (elem, startWidth, endWidth, steps, intervals, powr) {
		if (elem.widthChangeMemInt) 
			window.clearInterval(elem.widthChangeMemInt);
			
		var actStep = 0;
		elem.widthChangeMemInt = window.setInterval(
			function() {
				elem.currentWidth = rollermenu.easeInOut(startWidth, endWidth, steps, actStep, powr);
				elem.style.width = elem.currentWidth + "px";
				elem.style.height = elem.currentWidth + "px";
				actStep++;
				if (actStep > steps) 
					window.clearInterval(elem.widthChangeMemInt);
			}, intervals)
	},
	
	easeInOut : function (minValue, maxValue, totalSteps, actualStep, powr) {
	//Generic Animation Step Value Generator By www.hesido.com
		var delta = maxValue - minValue;
		var stepp = minValue + (Math.pow(((1 / totalSteps) * actualStep), powr) * delta);
		return Math.ceil(stepp)
	},
	
	imgSmall : function (obj) {
		imgSrc = obj.getAttribute("src");
		var typePos = imgSrc.indexOf(rollermenu.imgType, 0);
		var imgName = imgSrc.substr(0, typePos);
		obj.setAttribute("src", imgName + "_small" + rollermenu.imgType);
	},
	
	imgLarge : function (obj) {
		imgSrc = obj.getAttribute("src");
		var typePos = imgSrc.indexOf("_small", 0);
		var imgName = imgSrc.substr(0, typePos);
		obj.setAttribute("src", imgName + rollermenu.imgType);
	}
}

// Add event with wide browser support
if ( typeof window.addEventListener != "undefined" )
    window.addEventListener( "load", rollermenu.init, false );
else if ( typeof window.attachEvent != "undefined" )
    window.attachEvent( "onload", rollermenu.init );
else {
    if ( window.onload != null ) {
        var oldOnload = window.onload;
        window.onload = function ( e ) {
            oldOnload( e );
            rollermenu.init();
        };
    } else {
        window.onload = rollermenu.init;
	}
}